Gibbsite solubility and thermodynamic properties of hydroxy-aluminum ions in aqueous solution at 25°C

May, Howard M.; Helmke, P. A.; Jackson, M. L.

doi:10.1016/0016-7037(79)90224-2

Cited by 305 publications

(78 citation statements)

References 12 publications

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“…In particular, the release/retention kinetics associated with exchangeable Al and Alhumus complexes are very rapid with an apparent equilibrium from both over-and under-saturation occurring within a 20-min residence time . Hydroxy-Al polymers appear to ultimately regulate Al solubility with a solubility product similar to that of synthetic gibbsite: log K ⁎ SO = 8.1 for the reaction Al(OH) 3 + 3H + = Al 3+ + 3H 2 O (May et al, 1979). Dahlgren and Walker (1993) obtained a slope of about 2.7 for several Spodosol Bs horizons, compared to a theoretical value of 3.0 for an Al(OH) 3 phase.…”

Section: Organic Carbon Accumulation In Andosolsmentioning

confidence: 96%

Nature, properties and function of aluminum–humus complexes in volcanic soils

2016

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Andosols (or Andisols) possess several distinctive properties that are rarely found in other groups of soils. These properties are largely due to the dominance of short-range-ordered minerals (allophane, imogolite and ferrihydrite) and/or metal-humus complexes (Al/Fe-humus complexes) in their colloidal fraction. While several papers have extensively reviewed the nature and properties of short-range-ordered minerals, there is no comprehensive review of the genesis, characteristics and management implications of Al-humus complexes, the dominant form of active Al in non-allophanic Andosols. In this review, we survey the chemical characteristics of Al-humus complexes and discuss the pedogenic environment favoring their formation in non-allophanic Andosols. The role of Al-humus complexes in carbon cycling and soil organic carbon accumulation is emphasized as an important mechanism controlling organic dynamics in Andosols. While non-allophanic Andosols share many common properties with allophanic Andosols, they display several distinct characteristics associated with Al-humus complexes, such as strong acidity and high exchangeable Al content that impair agricultural productivity due to Al phytotoxicity. Thus, we focus on the role of Al-humus complexes in regulating aqueous Al 3+ solubility and release/retention kinetics, Al phytotoxicity, phosphorus dynamics, and suppression of soil-borne diseases. Knowledge of these soil properties as related to Al-humus complexes is necessary to develop effective soil management practices to assure sustainable agricultural productivity in non-allophanic Andosols. Finally, future research needs are identified concerning the role of Al-humus complexes in regulating soil biogeochemical processes.

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Section: Organic Carbon Accumulation In Andosolsmentioning

confidence: 96%

Nature, properties and function of aluminum–humus complexes in volcanic soils

2016

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“…Field observations of elevated levels of Al (highly oversaturated with respect to the solubility of natural gibbsite (p x K,, = 8.77; May et al 1979) after A1C13 addition might be attributed to the relatively short hydraulic retention time (4.6 min) of the experimental reach (15 m) and to relatively slow rates of Al removal. Laboratory observations suggest that over short periods (10 min) the degree of Al removal was influenced by particles in solution through adsorption reactions.…”

Section: Notesmentioning

confidence: 99%

Physical, chemical, and biological consequences of episodic aluminum additions to a stream1

Hall¹,

Driscoll²,

Likens³

et al. 1985

Limnology & Oceanography

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AlCl3 was added to a second‐orderroborated field results, added Al producing a 20% reduction in surface tension. We suggest that added Al may have associated with organic functional groups, rendering DOC more hydrophobic and less soluble. Some of these alumino‐organic substances subsequently may have accumulated at the air‐water interface. Terrestrial and aquatic invertebrate drift was also altered with elevated Al; we attribute drift to responses to chemical changes in the stream such as Al and H+ toxicity or to a physical change in surface film. stream to simulate episodic increases in Al concentration during acidic snowmelt. Significant decreases in pH and DOC and accumulation of foam at the surface (visible evidence of reduced surface tension) accompanied a stepwise increase in Al in the water. Laboratory experiments cor

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“…McBride 1994). Aluminum is a strongly hydrolyzing metal and relatively insoluble in the neutral pH range (6.0 to 8.0) (May et al 1979). Under acidic (pH <6.0) or alkaline (pH >8.0) conditions, and/or in the presence of complexing ligands, the solubility of Al is enhanced, making it more available for biogeochemical transformations.…”

Section: Chemical Protection Of Organic Mattermentioning

confidence: 99%

The Role of Aluminum-Organo Complexes in Soil Organic Matter Dynamics

Hernandez‐Soriano¹

2012

Soil Health and Land Use Management

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Gibbsite solubility and thermodynamic properties of hydroxy-aluminum ions in aqueous solution at 25°C

Cited by 305 publications

References 12 publications

Nature, properties and function of aluminum–humus complexes in volcanic soils

Nature, properties and function of aluminum–humus complexes in volcanic soils

Physical, chemical, and biological consequences of episodic aluminum additions to a stream1

The Role of Aluminum-Organo Complexes in Soil Organic Matter Dynamics

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